one measure of fallout from lance armstrong's tell-all oprah moment. >> we agreed that there would be no conditions on this interview. >> reporter: where he will explain why he used performance-enhancing drugs. >> we were mesmerized and riveted by some of his answers. he certainly had prepared himself for this moment. >> reporter: a moment armstrong's former personal assistant says he never saw coming. mike anderson is speaking out to abc news from new zealand, in his first televised interview. >> he made the mistakes. but there were guys behind the scenes who built him up, who sold that lie to the public. >> lance armstrong just confirmed his tour de france win! >> reporter: it's not just the lying, but the years of lies. >> what am i on? i'm on my bike. >> reporter: the adamant, vicious denials, even under oath. >> how could it have taken place when i've never taken performance-enhancing drugs? how could that have happened? >> that was my point. not simply you don't recall. >> how many times do i have to say it? >> reporter: few saw that side up close like anderson, who says the man